ITP-Jan 2025 | London | Maryna Romanova | Module-Structuring-and-Testing-Data | Week 6 | Sprint 3

Sprint-1/1-key-exercises/1-count.js

@@ -1,6 +1,9 @@
 let count = 0;
 
 count = count + 1;
+console.log(count)
+
+// 1 - From running slightly =0, then add extra line with +1. With new count =0+1=1, is assing
 
 // Line 1 is a variable declaration, creating the count variable with an initial value of 0
-// Describe what line 3 is doing, in particular focus on what = is doing
+// Describe what line 3 is doing, in particular focus on what = is doing - the line 3 provide new value for count

Sprint-1/1-key-exercises/2-initials.js

@@ -5,7 +5,13 @@ let lastName = "Johnson";
 // Declare a variable called initials that stores the first character of each string.
 // This should produce the string "CKJ", but you must not write the characters C, K, or J in the code of your solution.
 
-let initials = ``;
+function initials(character) {
+    return character.toString().slice(0,1);
+  }
+
+  console.log(`The first character of each string is ${initials(firstName)}${initials(middleName)}${initials(lastName)}`);
+
+
 
 // https://www.google.com/search?q=get+first+character+of+string+mdn
 

Sprint-1/1-key-exercises/4-random.js

@@ -3,7 +3,10 @@ const maximum = 100;
 
 const num = Math.floor(Math.random() * (maximum - minimum + 1)) + minimum;
 
-// In this exercise, you will need to work out what num represents?
+console.log(`Random number between ${minimum} and ${maximum}: ${num}`);
+
+
+// In this exercise, you will need to work out what num represents? - generates a random integer between minimum and maximum by formula
 // Try breaking down the expression and using documentation to explain what it means
 // It will help to think about the order in which expressions are evaluated
-// Try logging the value of num and running the program several times to build an idea of what the program is doing
+// Try logging the value of num and running the program several times to build an idea of what the program is doing - Each time run the program, num will be different, and it will always be between 1 and 100, inclusive. 

Sprint-1/2-mandatory-errors/0.js

@@ -1,2 +1,3 @@
-This is just an instruction for the first activity - but it is just for human consumption
-We don't want the computer to run these 2 lines - how can we solve this problem?
+// This is just an instruction for the first activity - but it is just for human consumption
+// We don't want the computer to run these 2 lines - how can we solve this problem?
+// We need to add - //

Sprint-1/2-mandatory-errors/1.js

@@ -1,4 +1,16 @@
 // trying to create an age variable and then reassign the value by 1
 
-const age = 33;
+const age = 33; //we need to change const to let. 
 age = age + 1;
+
+let age2 = 33;
+age2 = age2 + 1;
+console.log (age2);
+
+//or we can use const age but add another variable 
+
+const age3 = 33; 
+let age4 = age3 + 1;
+console.log (age4);
+
+

Sprint-1/2-mandatory-errors/2.js

@@ -3,3 +3,8 @@
 
 console.log(`I was born in ${cityOfBirth}`);
 const cityOfBirth = "Bolton";
+
+// need to change lines, console.log need be in the end
+
+const cityOfBirth = "Bolton";
+console.log(`I was born in ${cityOfBirth}`);

Sprint-1/2-mandatory-errors/3.js

@@ -2,8 +2,20 @@ const cardNumber = 4533787178994213;
 const last4Digits = cardNumber.slice(-4);
 
 // The last4Digits variable should store the last 4 digits of cardNumber
-// However, the code isn't working
-// Before running the code, make and explain a prediction about why the code won't work
-// Then run the code and see what error it gives.
-// Consider: Why does it give this error? Is this what I predicted? If not, what's different?
+// However, the code isn't working 
+// Before running the code, make and explain a prediction about why the code won't work - we don't have consele.log 
+// Then run the code and see what error it gives. - TypeError: cardNumber.slice is not a function
+// Consider: Why does it give this error? Is this what I predicted? If not, what's different? - so we don't have a function, we don't return any answer
 // Then try updating the expression last4Digits is assigned to, in order to get the correct value
+
+  const cardNumber = 4533787178994213;
+
+  function lastDigits(cardNumber) {
+    const cardStr = cardNumber.toString(); // Convert the number to a string
+    return cardStr.slice(-4); // Get the last 4 digits
+  }
+
+  console.log(`The last 4 digits are ${lastDigits(cardNumber)}`);
+
+
+

Sprint-1/2-mandatory-errors/4.js

@@ -1,2 +1,2 @@
 const 12HourClockTime = "20:53";
-const 24hourClockTime = "08:53";
+const 24hourClockTime = "08:53";  //I don't understand the task

Sprint-1/3-mandatory-interpret/1-percentage-change.js

@@ -2,7 +2,7 @@ let carPrice = "10,000";
 let priceAfterOneYear = "8,543";
 
 carPrice = Number(carPrice.replaceAll(",", ""));
-priceAfterOneYear = Number(priceAfterOneYear.replaceAll("," ""));
+priceAfterOneYear = Number(priceAfterOneYear.replaceAll(",","")); // I see syntax problem, it's missing coma ,
 
 const priceDifference = carPrice - priceAfterOneYear;
 const percentageChange = (priceDifference / carPrice) * 100;
@@ -12,11 +12,13 @@ console.log(`The percentage change is ${percentageChange}`);
 // Read the code and then answer the questions below
 
 // a) How many function calls are there in this file? Write down all the lines where a function call is made
+// I see just one function call - console.log (line 10)
 
 // b) Run the code and identify the line where the error is coming from - why is this error occurring? How can you fix this problem?
-
+// line 5
 // c) Identify all the lines that are variable reassignment statements
-
+//line 4 and 5
 // d) Identify all the lines that are variable declarations
-
+// all the lines with let and const 1, 2, 7, 8
 // e) Describe what the expression Number(carPrice.replaceAll(",","")) is doing - what is the purpose of this expression?
+// carPrice.replaceAll(",", "") removes all commas from the string, producing "10000" and "8543".

Sprint-1/3-mandatory-interpret/2-time-format.js

@@ -12,14 +12,15 @@ console.log(result);
 // For the piece of code above, read the code and then answer the following questions
 
 // a) How many variable declarations are there in this program?
-
+// 6 in total all line with const
 // b) How many function calls are there?
-
+// just one line 10 - console.log
 // c) Using documentation, explain what the expression movieLength % 60 represents
 // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Arithmetic_Operators
-
+//Since movieLength is in seconds, movieLength % 60 gives the remaining seconds after dividing the total time into full minutes.
 // d) Interpret line 4, what does the expression assigned to totalMinutes mean?
-
+//The expression (movieLength - remainingSeconds) / 60 converts the total movie length in seconds to the total number of full minutes.
 // e) What do you think the variable result represents? Can you think of a better name for this variable?
-
+//The variable result represents the formatted movie length in the format. Name can be movieTimeFormatted
 // f) Try experimenting with different values of movieLength. Will this code work for all values of movieLength? Explain your answer
+// yes it's will work

Sprint-1/3-mandatory-interpret/3-to-pounds.js

@@ -25,3 +25,9 @@ console.log(`£${pounds}.${pence}`);
 
 // To begin, we can start with
 // 1. const penceString = "399p": initialises a string variable with the value "399p"
+// 2. const penceStringWithoutTrailingP = penceString.substring( 0, penceString.length - 1); : removing p from the number 399
+// 3. const paddedPenceNumberString : we are checking if the number has min 3 digits, if less than we will add "0" in the start. 
+// 4. paddedPenceNumberString.length - 2 : calculates the position 2 characters from the end.
+// 5..substring(paddedPenceNumberString.length - 2 : extracts the last 2 characters. 
+// 6. .padEnd(2, "0") : if our new number (paddedPenceNumberString.length) will have less then 2 digits we will add extra 0. 
+// 7. console.log(`£${pounds}.${pence}`) : the result where we will add pounds and pence together. 

Sprint-2/1-key-errors/0.js

@@ -1,5 +1,6 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here - we don't have console.log, it's will not show anyting
+
 
 // call the function capitalise with a string input
 // interpret the error message and figure out why an error is occurring
@@ -9,5 +10,12 @@ function capitalise(str) {
   return str;
 }
 
-// =============> write your explanation here
+// =============> write your explanation here - SyntaxError: Identifier 'str' has already been declared
+// We need to change let to another name so it's not much with variables 
 // =============> write your new code here
+
+function capitalise(str) {
+  let capitalizedStr = `${str[0].toUpperCase()}${str.slice(1)}`;
+  return capitalizedStr;
+}
+console.log(capitalise("hello"));

Sprint-2/1-key-errors/1.js

@@ -1,7 +1,7 @@
 // Predict and explain first...
 
 // Why will an error occur when this program runs?
-// =============> write your prediction here
+// =============> write your prediction here - we are return percentage but in console.log decimalNumber, we need to change decimalNubmer to real number 
 
 // Try playing computer with the example to work out what is going on
 
@@ -14,7 +14,14 @@ function convertToPercentage(decimalNumber) {
 
 console.log(decimalNumber);
 
-// =============> write your explanation here
+// =============> write your explanation here -  SyntaxError: Identifier 'decimalNumber' has already been declared
 
 // Finally, correct the code to fix the problem
 // =============> write your new code here
+
+function convertToPercentage(decimalNumber) {
+  const percentage = `${decimalNumber * 100}%`;
+  return percentage;
+}
+
+console.log(convertToPercentage(0.5));

Sprint-2/1-key-errors/2.js

@@ -3,18 +3,24 @@
 
 // this function should square any number but instead we're going to get an error
 
-// =============> write your prediction of the error here
+// =============> write your prediction of the error here - Undefine error.As we don't have parameter num.  
 
 function square(3) {
     return num * num;
 }
 
-// =============> write the error message here
 
-// =============> explain this error message here
+
+// =============> write the error message here - Syntax Error. 
+
+// =============> explain this error message here - mistake in the function name, as parameter can't start with the number. 
 
 // Finally, correct the code to fix the problem
 
 // =============> write your new code here
 
+function square(num) {
+    return num * num;
+}
+console.log(square(3))
 

Sprint-2/2-mandatory-debug/0.js

@@ -1,14 +1,21 @@
 // Predict and explain first...
 
-// =============> write your prediction here
+// =============> write your prediction here - undefined as we don't have parameters a and b
 
 function multiply(a, b) {
   console.log(a * b);
 }
 
 console.log(`The result of multiplying 10 and 32 is ${multiply(10, 32)}`);
 
-// =============> write your explanation here
+// =============> write your explanation here - The result of multiplying 10 and 32 is undefined
 
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function multiplyFixed(a, b) {
+
+  return (a * b);
+}
+
+console.log(`The result of multiplying 10 and 32 is ${multiplyFixed(10, 32)}`);

Sprint-2/2-mandatory-debug/1.js

@@ -1,13 +1,21 @@
 // Predict and explain first...
-//  =============> write your prediction here
+//  =============> write your prediction here - undefined as we don't have parameter return
 
-function sum(a, b) {
+function sum1(a, b) {
   return;
   a + b;
 }
 
-console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);
+console.log(`The sum of 10 and 32 is ${sum1(10, 32)}`);
+
+// =============> write your explanation here - undefined as we don't have parameter return
 
-// =============> write your explanation here
 // Finally, correct the code to fix the problem
 //  =============> write your new code here
+
+function sum(a, b) {
+  return (a + b);
+
+}
+
+console.log(`The sum of 10 and 32 is ${sum(10, 32)}`);

Sprint-2/2-mandatory-debug/2.js

@@ -1,7 +1,7 @@
-// Predict and explain first...
+// Predict and explain first - 4,2 , 10,5 , 80,6
 
 // Predict the output of the following code:
-// =============> Write your prediction here
+// =============> Write your prediction here - if slice -1 from the number, then 42 slice will be 4,2
 
 const num = 103;
 
@@ -13,12 +13,22 @@ console.log(`The last digit of 42 is ${getLastDigit(42)}`);
 console.log(`The last digit of 105 is ${getLastDigit(105)}`);
 console.log(`The last digit of 806 is ${getLastDigit(806)}`);
 
-// Now run the code and compare the output to your prediction
-// =============> write the output here
-// Explain why the output is the way it is
-// =============> write your explanation here
+// Now run the code and compare the output to your prediction 
+// - 3 - slice (-1) takes from const number and not from getLastDigit
+// Explain why the output is the way it is - in the code don't getLastDigit parameter
+// in the code don't getLastDigit parameter
 // Finally, correct the code to fix the problem
 // =============> write your new code here
 
+const num = 103;
+
+function getLastDigit(num2) {
+  return num2.toString().slice(-1);
+}
+
+console.log(`The last digit of 42 is ${getLastDigit(42)}`);
+console.log(`The last digit of 105 is ${getLastDigit(105)}`);
+console.log(`The last digit of 806 is ${getLastDigit(806)}`);
+
 // This program should tell the user the last digit of each number.
 // Explain why getLastDigit is not working properly - correct the problem

Sprint-2/3-mandatory-implement/1-bmi.js

@@ -15,5 +15,13 @@
 // It should return their Body Mass Index to 1 decimal place
 
 function calculateBMI(weight, height) {
+    let squaringHeight = height * height;
+    let BMI = weight / squaringHeight;
+
+    return BMItoFixed(1); 
+
     // return the BMI of someone based off their weight and height
-}
+}
+
+console.log (calculateBMI(50,1.65));
+

Sprint-2/3-mandatory-implement/2-cases.js

@@ -14,3 +14,14 @@
 // You will need to come up with an appropriate name for the function
 // Use the MDN string documentation to help you find a solution
 // This might help https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/toUpperCase
+
+function caseSnake(sentence) {
+    return sentence.toUpperCase().replace(/ /g, "_");
+}
+
+console.log(caseSnake("hello there"));
+
+
+
+
+

Sprint-2/4-mandatory-interpret/time-format.js

@@ -17,18 +17,28 @@ function formatTimeDisplay(seconds) {
 // Questions
 
 // a) When formatTimeDisplay is called how many times will pad be called?
-// =============> write your answer here
+// 3 times - totalHours, remainingMinutes, remainingSeconds
 
 // Call formatTimeDisplay with an input of 61, now answer the following:
 
 // b) What is the value assigned to num when pad is called for the first time?
-// =============> write your answer here
+// When formatTimeDisplay(61) is called:
+//seconds = 61
+//remainingSeconds = 61 % 60 = 1
+//totalMinutes = (61 - 1) / 60 = 1
+//remainingMinutes = 1 % 60 = 1
+//totalHours = (1 - 1) / 60 = 0
 
 // c) What is the return value of pad is called for the first time?
-// =============> write your answer here
+//When pad(0) is called:
 
-// d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+//num.toString() converts 0 to "0".
+//.padStart(2, "0") ensures the string is at least 2 characters long by padding it with "0" at the start.
 
+// d) What is the value assigned to num when pad is called for the last time in this program?  Explain your answer
+//The last time pad is called is for remainingSeconds, which is the value of 1 in this case (from remainingSeconds = 61 % 60 = 1
 // e) What is the return value assigned to num when pad is called for the last time in this program?  Explain your answer
-// =============> write your answer here
+// When pad(1) is called:
+
+//num.toString() converts 1 to "1".
+//.padStart(2, "0") ensures the string is at least 2 characters long by padding it with "0" at the start.